Issue #1  Can't delete partitions for clean install of Windows 10

Make sure you only have one disk that you intend to install Windows connected. You can try:

1. Boot up with Windows installation media (USB/DVD)

2. On the first screen. Press SHIFT + F10 and type
   diskpart
   select disk 0
   clean

   ("select disk 1 clean" if any)
   exit
   exit

3. Continue with Installation, select custom, select the unallocated partition then click Next (Do not create partition/format. Let Windows create the needed partitions.

4. When prompted for product key. Click on "I don't have the product key" or "Skip this step"